The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 20 g | 23y¢ |
Every additional 10 g or less | 12y¢ | |
Postcards | Per piece | 90¢ |
Xavier sent 4 postcards and a letter. The letter weighed 23 g. How much did Xavier pay in total? Give your answer in terms of y in the simplest form.